Poration



BEST AVAiLABLE COP J. H. HUNT MAGNETO Filed Oct. 24 1923 4 Sheets-Sheet1 [22 ZJ'EZZ 20F By w BEST AVAILABLE COP J] H. HUNT Dec. 28 1926.

MAGNETO Filefl Oct 24 1923 a 4 Sheets-Sheet :3

BEST AVAILABLE COP Dec. 28 1926.

J. H. HUNT MAGNETQ Filed Oct.

24 1923 4 Sheets-Sheet I5 BEST AVMLABLE COP.

Dec. 28 1926.

J. H. HUNT MAGNETO 4 Sheets- Sheet Filed Oct. 24 1923 Patented Dec. 28,1926.

BEST AVAILABLE COP UNITED STATES PATENT OFFECE.

JOHN H. HUNT, OF DAYTON, OHIO, ASSIGNOR TO GENERAL MOTORS RESEARCH COR-PORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

MAGNETO.

Application filed October 24, 1923.

This invention relates to magnetos and particularly to magnetos whichare adapted to supply ignition for intermil-combustion engines.

Among the objects of the invention are the simplification of theconstruction of magnetos whereby the number of parts is reduced andeconomy inmanufacture is obtained; and the provision of suchimprovements in construction as are conducive to durability andeflicient operation.

Further objects and advantages of the present invention. will beapparent from the following description, reference being bad to theaccompanying drawings, wherein preferred forms ofembodiment ofthepresent invention are clearly shown.

In the drawings:

Fig. 1 is a plan view of a magneto embodying one form of the invention.

Fig. 2 is a sectional view on the line 22 of Fig. 1.

, Fig. 3 is. a sectional view on the line 33 of Fig. 1. I

Fig. 4 is a sectional View on the line H of Fig. 1. v

Fig. 5 is an end view on an enlarged scale of one of the magneto framemembers which supports the magneto armature.

Fig. 6 is a side view thereof.

In the drawings, 20 designates the frame of a machine such as aninternal-combustion engine which is supplied with ignition by themagneto. The wall 21 of frame 20 is provided with a circular opening forreceiving the annular boss 22, extending from a mounting flange 23formed integrally with the non-magnetic magneto frame member 24. Frame24 includes a bell-shaped housing 25 joined to the mounting flange 23 byhub 26 and a plurality of ribs 27. The mounting flange 23 is attached tothe machine frame 20 in any convenient manner, such as by bolts, onebeing shown at 23.

The rim of the bellshaped housing 25 is provided with a flange 28 havingan annular extension 29 which is received by recess 30 provided in thecover 31 of the housing 25. The cover member 31 is provided with abearing 32 lubricated by a felt disk 33 which is supplied with lubricantthrough an oiler 34. The bearing 32 is maintained in alinement with thebearin 35 in the hub 26 of rim 24 by means of the engagement of theannular boss 2.9 with the recess 30 said boss Serial No. 670,616.

and recess being concentric with the bear ings 32- and 35.

The cover 31 includes two laminated pole pieces 36 and 37 which arejoined together by solid rivets 38, hollow rivets 39 and solid rivets40. Rivets 39 and 40 have tubular end port-ions which are flaredoutwardly to anchor the pole pieces to the metal of the non-magneticcover member 31. The pole pieces 36 and 37 are placed in a mold so thattheir arcuate inner faces are in alinement and are located the samedistance from a common center of curvature. Then the molten metal forforming the member 31 is poured into the mold around the pole pieces inorder to form when hardened a substantially cup-shaped cover memberhaving an opening 41 through one side thereof between projectingportions of the pole pieces 36 and 37. Bearing member 32 may be locatedin position by casting the metal of the cover around it. The cover 31 isprovided with openings 42 in alinement with the openings in theanchoring rivets 39. Bolts 43 pass through the holes 42 and are threadedinto the housing 25 for the purpose of attaching the cover 31 to thehousing 25.

The magneto shaft (see Fig. 3) includes portions of various diameters,namely, portion 51 providing a journal for the shaft within the bearing32, portion 52, portion 53 providing a journal for the shaft withinbearing 35, portion 54 and portion 55. The portion 54 receives a thrustwasher 56 which is located between one end of the bearing 35 and a gear57 which is keyed to the portion and is secured by washer 58 and nut 59engaging threaded end of shaft portion 55.

In case of an internal-coinhustion engine, the gear 57 may be connectedby a gear chain with the timing gears of the engine or may mesh directlywith one of said gears. Oil for lubricating the gears is conductedadjacent thereto through a pipe 60. Some of this oil will be conductedthrough a duct 61, through the hub 26, and the excess will be conductedthrough duct 62 back to the machine frame which obviously provides ahousing for the gear 57.

The hub 26 is provided with a tubular extension 63 located at rightangles to the bearing 35. A timer-distributer unit designated as a wholeby numeral 70'includes the usual timer circuit breaker distributing"apparatus housed. within a. cup 71 and a dis= tion of shaft is a,laminated ole ,of gear 78 tend ,to push the oil -netic material attached.me'ens of screws 86.

" pole closed by a case tributor head 72. The timer cup 72 includes atubular shank 73 providing a bearing for a timer shaft 74. The shank 7 3is received by the tubular extension 63 and is held in place by a setscrew 75. The shaft 74 carries a. spiral gear 76 clamped on the taperedend of shaft 74: by a nut 77. The spiralyear 76 meshes with a spiralgear 78 forme on the journal .53 of shaft 50. The direction of rotationof shaft 50 is clockwise. as viewed in Fig. fl;,-S0 that-the directionof thrust of shaft 50 is toward the'right, as viewed .in

; F|i r. 3, thereby causing the thrust washer 56 to be coged by theendof bearing 35 and the hub .0 gear 57: The direction of rotaindicated bythe arrow 79 in F ig. 3. It is therefore a parent that oil received bythe gear'78 wil be pushed toward the left as viewed in Fig. 3.'Therefore, during rotation of the shaft in the directionof arrow 79shown in Fi 3,'t he teeth away from the magnet housing 25.

A permanent horseshoe magnet 80 in- .cludes branches ,81- havingcylindrical outer surfaces and includes a yoke portion 82 at- :tached,to the shaftportion 52 by means of a .key 83. Each branch '81 isprovided with portion 84 which is attached by casting the metal of themagnet in a mold in which laminated pole portions 84 have bfi located.The branches 81 aresupported by through the agency of a Ltheshaft 5].disk 85.of non-magto the poles 81 by As shown in Fig. '3. the disk 85 isprovided with a hole for receiving the shaft portion 51.

The magneto armature designated in its entirety by numeral 90, includescore 91 having a plurality of laminations bound together by -rivets ,92to provide in effect a solid bar having holes for receiving bolts 93threaded into tapped holes in the armature pieces 36 and 37, whereby thecore 91 may be detachably secured in position. The armature includesprimary coil .94 and the secondary coil 95 arranged concentrically innon-conducting tube 96. These windings encomprise a tubular member 97and end members 98 which are apertured to receive the core 91. Theremovability of the core 91 from the armature poles 36 and 37 permitsthe manufacture of the armature coils and casing as a separate unitthrough which the core 91 is inserted and then attached to the poles 36and 37 by the screws 3, The tubular member 97 closes the opening in thecover 31. A sealing plate 99 of non-conducting material is located, asshown in Fig. 3. between the tubular casing member 97 and the covermember 31. The end members 98 of the armature coil housing each carry aprimary terminal 100 connected with one end of the primary winding 9e;and the free. ends of BEST AVAILABLE COPv outside of the serum-lacy whiling 95 is conncc-ted with a high tension lcrn'linul 'iUi :zttached tothe tubular member 97.

The primary terminals 100 are connected with the usual timer contacts ofthe timerdistributor unit 70. and the high tension terminal 101 isconnected with the (llSbl'llHlilllg apparatus in the usual manner.Rotation .of the armature shaft produces reversals of .flux in thestationary magnet circuit which includes the core 91 and poles so and2-37.. These flux reversals cause an alternating current to be producedin the n'imary winding 94. Approximately at the peaks of the currentwaves the timer contacts are opened 2o induce in the secondary winding95 sparking impulses. These sparking impulses are conducted by suitableconductors (not shown) leading from the high tension terminal 101 to thedistributing apparatus of the unit 70, from which these sparkingimpulses are distributed in the various spark plugs of an engine.

To facilitate providing a hole through the yoke 82 of the magnet. .themagnet material is cast around a body 87 of material. softer than themagnet steel- The hole for shaft portion 52 is provided in this body 87.

lVhile the forms of embodiment of the present invention as hereindisclosed, constitute preferred forms. it is to be understood that otherforms might be adopted. all .coming within the scope of the claims whichfollow.

What- I claim is as follows:

1. A magneto comprising. in combination. a rotatable magnet. a magnethousing proriding a bearing and a mounting bracket. :1 cover for saidhousing providing a bearing. a shaft carrying said niagnet and supportedby said bearings. and an armature supported by said cover.

2. A magneto comprising. in combination. a rotatable magnet. a magnethousing pro riding a bearing and a flange mounting at one cud of thehousing perpendicular to the axis of said bearing. a cover for said housiug providing a bearing. a shaft carrying said magnet and supported bysaid bearings. and an armature supported by said cover.

3. A magneto comprising. in combination, a rotatable magnet, a timer. ashaft supporting and driving a magnet. housing providing a bearing for=aid shaft and support ng the timer. cover for said housing providing abearing for said shaft. and an armature supported by said cover.

4. A magneto comprising. in combination. a rotatablemagnet. a housingenclosing and supporting said magnet. a magnet shaft journalled in saidhousing". a timer. spiral gearing connecting the timer and magnet--haft. an oil duct connecting the spiral gear on the magnet shaft withthe exterior of the the magnet and the timer.-

1,612,726 BEST AVAILAELE COP housing, said gear operating to propellubricant toward said duct.

5. A magneto comprising, in combination, a rotatable magnet, a magnetshaft. a magnet housing supporting said shaft and providing a bearingtherefor, and a duct leading from the bearing to the exterior of thehousing and means for propelling oil away from the interior of themagnet housing toward said oil duct.

6. A magneto comprising, in combination, an arn'iature having laminatedcore poles, a rotatable magnet and a magnet housing and end covertherefor supporting the magnet, said cover including non-magneticmaterial anchored to said poles.

7. A magneto comprising, in combination, an armature having laminatedcore poles, the laminations being secured together by rivets with flaredprojecting ends, a rotatable magnet and a magnet housing and covertherefor, said cover including non-magnetic material anchored to saidpoles by being cast around said rivet projections.

8. A magneto comprising, in combination, an armature having laminatedcore poles, the laminations being secured together by hollow rivets withflared projecting ends, a rotatable magnet, a magnet housing and covertherefor, said cover including nonmagnetic material anchored by beingcast in place about said rivet projections, and bolts passing throughsaid hollow rivets for attaching the cover to the housing.

In testimony whereof I hereto alfix my signature.

JOHN H. HUNT.

